盐助燃烧合成法大规模制备超细LaB<sub>6</sub>粉体及其烧结性能

doi:10.11896/cldb.21010240

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Abstract LaB₆ is an excellent cathode material for field emission, with strong anti-radiation and anti-poisoning pollution capabilities. It is widely used in military and high-tech fields such as aerospace, electronic industry, instrumentation and medical equipment. In this work, kilogram-scale LaB₆ powders were successfully prepared by the salt-assisted combustion synthesis method. The LaB₆ powder was characterized by X-ray diffraction (XRD), cold field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). LaB₆ particles adopted the cubic phase with the average particle size of 345—890 nm, and the purity is higher than 99.9%. Then, the LaB₆ bulk materials were obtained by spark plasma sintering (SPS) and hot sintering under the same sintering pressure of 35 MPa at different sintering temperatures of 1 600—1 800 ℃ and 1 800—1 900 ℃ respectively. As a result, the sintered materials with relative densities of 93.50% and 95.75% were obtained. The Vickers hardness of the hot pressed sample at 1 900 ℃ was measured to be (14.83±1) GPa by HBRVU-187.5 Brinell Rockwell & Vickers optical hardness tester, and the flexural strength of the sample was calculated to be 137.04 MPa by the three-point bending method.

Key words： salt-assisted combustion synthesis LaB₆ powder SPS hot pressed sintering relative density

Published: Online: 2022-06-09

CLC number:

TG139.8

Fund:Science and Technology Plan of Gansu Province (18YF1WA069).

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	Articles by authors
	AN Ning
	WU Haokai
	ZHU Min
	ZHENG Yuehong
	ZHAN Faqi
	LA Peiqing

Cite this article:

AN Ning,WU Haokai,ZHU Min, et al. Research on the Large-scale Preparation of Ultrafine LaB₆ Powders by Salt-assisted Combustion Synthesis and Its Sintered Properties[J]. Materials Reports, 2022, 36(11): 21010240-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21010240 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21010240

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